Key-hole guard



(No Model.)

J. B. BENNETT. KEY HOLE GUARD.

Patented Dec. 31, 1889..

N. PETERS` phdvuthngnphar. Wash-MMM, D. C.

UNITED STATES PATENT OFFICE.

JOHN BISHOP BENNETT, OF BOSTON, MASSACHUSETTS.

KEY-HOLE GUARD.

SPECIFICATION forming part of Letters Patent No. 418,267, dated December 31, 1889.

Application filed May 3, 1889. Serial No. 309.481. (No model.)

T 0 all wwnt it may concern:

Be it known that l, JOHN BISHOP BENNETT, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Key-Hole Guards, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to an improvement in door-locks or other like locks of that class which have key-holes on opposite sides of the lock-case.

The objects of my improvement are, lirst, to provide means whereby the insertion of the key on either side of the lock-case will operate to close the key-hole on the opposite side, thereby preventing all access to the interiorof the lock from the closed side, either for the purpose of ejecting or turning the key or for introducing other keys, and, second, to cut off all View of a room through the key-hole.

My invention consists, essentially, of a thin plate mounted within the lock-case in the manner as hereinafter described and claimed, ret'- erence being had to the accompanying drawings, of which- Figure 1 represents theinterior of a mortiselock having my improvement, one side of the case having been removed. Fig. 2 represents a transverse section at 0L, the lock-bolt being omitted. Fig. 3 represents a vertical section at l), the lock-bolt being omitted and the key inserted from the side opposite that shown in Fig. 2. Fig. 4 represents a view in perspective of the guard-plate shown in Figs. l, 2, and 3.

The lock-case A, catch-bolt B, lock-bolt C, and tumblers D do not differ from like parts usually found in this class of locks.

E and F are the side walls of the lock-case, wall E being' removable, as is usual. Said walls are provided with oppositely-arranged key-holes 7L and z', whereby the key j may be inserted from either side.

H is a thin plate, preferably of steel, which is arranged within the lock-case between the side walls E and F and extends nearly the whole length of the lock-case, the end farthest from the key-hole being secured to the lockcase about midway between the two walls, the other end of the plate opposite the key-hole being left free to swing toward either wall, thus formingpractically a movable partition between the key-holes.

For the purpose of supporting the end of the key-barrel, pins 0 0 project from opposite sides of the plate H opposite the eyes of the keyholes. p

The operation of my device is as follows: Vhen the key is inserted in the key-hole on either side of the lock-case, the free end of plate H is pushed before it against the opposite wall of the case, thus completely covering the opposite key-hole. The plate, standing at all times between the key and the key-hole opposite that which the key has entered, prekey-hole, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence 0f two subscribing Witnesses, on this 15th day of November, A. D. 1888.

JOHN BISHOP BENNETT.-

NVitnesses:

A. C. M. BoWLEs, CHAs. A. KELLOGG. 

